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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abf92b8cd666a5836411ba1c0ef232ceae4f262d0b48428dfb443708f0b5faa' 
  AND token = 'qUN0vTULbospNVI0sl1CNRTnXXzILYn17JLpWETZRHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}